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IPC21I-SO-G-LF-TR Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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IPC21I-SO-G-LF-TR Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 12 page Power Management IPS20 and IPS21 © Copyright 2006-2009 - ASIC Advantage, Inc. AADS00001/AA743 - Revision 5– Dec 2008 11 / 12 VSENSE (Pin 2), VCOMP (Pin 3) The internal voltage reference for voltage feedback is 1.19 volts. The output voltage being sensed/regulated should have a voltage divider to 1.19 volts connected to pin 2. For good voltage feedback loop performance, no capacitor should be connected from pin 2 to ground. The recommended series-RC component values from pin 2 to pin 3 to roll-off the loop gain are 10k ohms and 68nF. OPTO (Pin 4) The OPTO pin is a current source (unlike a shunt regulator like the TL431, which is a current sink). The intended connection for the voltage feedback network is to connect the OPTO pin to the anode of the photodiode in an optoisolator, with the cathode of the photodiode connected to ground. The IPS20/21 use very little current to operate, but the user is reminded that the OPTO current being sourced comes through the VCC pin. ICOMP (Pin 5) and IS (Pin 6) The current sense resistor connects between IS and GND. For a positive output power supply, IS is the negative output pin. The internal voltage reference for current limiting (50 millivolts for IPS20, 100 millivolts for IPS21) is referenced to GND. The recommended component values from pin 5 to pin 6 to roll-off the loop gain are a series 10k ohms and 220pF, in parallel with 68nF. To reduce susceptability to noise spikes, an additional RC filter network might be desireable from IS to GND (refer to the Typical Application Schematic Figure 1 above). OUT(-) (Pin 7) The negative side of the internal voltage reference for voltage feedback is connected here. For a typical application with a positive output voltage and a current sense resistor, this pin connects to the more-negative pin of the output voltage. This configuration allows the voltage feedback to compensate for the voltage drop across the current sense resistor (which will vary with load). EVALUATION BOARD There is an evaluation board (AAEV2021) available for the IPS20 and IPS21 feedback controllers. Contact AAI Marketing for more details. There are also benchmark/reference designs available that include AAI Flyback Controllers, and Application Notes. PACKAGE DIMENSIONS AND MARKING The IPS20 and IPS21 are available in plastic 8-pin DIP and plastic 8-pin SOIC packages. Refer to the latest version of specification AAPS001 (ASIC Advantage’s “Package Numbering, Marking, and Outline Standard”, available at www.asicadvantage.com) for specific information concerning the package dimensions and package marking. Part Number/Tube Part Number/Tape&Reel Package Temperature Range IPS20C-D-G-LF IPS21C-D-G-LF NA 8-Pin PDIP 0 °C to +70°C Commercial IPS20I-D-G-LF IPS21I-D-G-LF NA 8-Pin PDIP -40 °C to +85°C Industrial IPS20C-SO-G-LF IPS21C-SO-G-LF IPS20C-SO-G-LF-TR IPS21C-SO-G-LF-TR 8-Pin SOIC 0 °C to +70°C Commercial IPS20I-SO-G-LF IPC21I-SO-G-LF IPS20I-SO-G-LF-TR IPC21I-SO-G-LF-TR 8-Pin SOIC -40 °C to +85°C Industrial |
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